Nitrogen-doped mesoporous carbon-coated titanium dioxide composite photocatalyst, a preparation method and use thereof

A method for preparing a nitrogen-doped mesoporous carbon-coated Titanium dioxide composite photocatalyst, characterized in that it comprises the steps of:

• S1. mixing an organic ligand, Ti(OC3H7)4, methanol and DMF into a reaction vessel with polytetrafluoroethylene;
• S2. placing the reaction vessel containing the mixed solution in S1 in an oven, rising the temperature to 120-160° C., maintaining this temperature for 24-72 hours, and then cooling to room temperature to obtain a precipitate;
• S3. cross washing the precipitate obtained in S2 with an alcohol and DMF, centrifuging, and drying under vacuum to obtain an activated Titanium-based MOF material;
• S4. heating the activated Titanium-based MOF material obtained in S3 to 500-800° C. in an inert gas atmosphere and maintaining the temperature for 2-12 h;
• after lowering the temperature to 300-500° C., replacing the inert gas with a weak oxidizing gas;
• maintaining the condition for 30-120 min, adjusting the atmosphere back to the original inert gas atmosphere and the temperature to room temperature, so as to prepare a nitrogen-doped mesoporous carbon-coated TiO2 composite photocatalyst.